/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ts, NodePredicate } from "qvog-dsl";
import { native, HomeCheckHint } from "qvog-dsl";

const SEVERITY = 2;
const DOC_PATH = '';
const DESCRIPTION = 'Enforce a maximum number of classes per file';
const MAX_CLASS = 3;

let classCount: Map<ts.SourceFile, number> = new Map();

export const ClassDeclaration: NodePredicate<ts.ClassDeclaration> = {
  is(node: ts.Node): node is ts.ClassDeclaration {
    return ts.isClassDeclaration(node);
  },
};

export default native<HomeCheckHint>()()
  .match(ClassDeclaration)
  .when((node: ts.ClassDeclaration): boolean => {
    let origin = classCount.get(node.getSourceFile());
    if (origin) {
        classCount.set(node.getSourceFile(), origin + 1);
        if (origin + 1 > MAX_CLASS) {
            return true;
        }
    }
    else {
        classCount.set(node.getSourceFile(), 1);
    }
    return false;
  })
  .report({
    severity: SEVERITY,
    description: DESCRIPTION,
    docPath: DOC_PATH,
  });

